I recently purchased two M7 BOC bayonets and notice some differences between the two. On one the cut at the end of the true edge is straight and parallel to the guard and on the other this cut is slightly curves back to the guard. On the one with the curve the blade true edge has a very slight "dip" in it over and area of about two inches before it reaches the guard. Also the shank tip staking on the pommel is different between the two. One is a small rectangle with almost no staking; the other is a larger oval that has been ground off flush with the hilt. Traces of what appears to be black paint has been applied to the staking. Neither of the two appear to have been altered in any way. My question is: could one of these have been rebuilt from parts like many of the M4 bayonets or are these differences due to loose manufacturing tolerances?